Resistance, or impedance, decreases electrical current per Ohm's law. Ohm's law gives current as a ratio of voltage to resistance: 1 volt flowing through 1 ohm of resistance produces 1 ampere of current. Resistance is th... More »

Electrical resistance in metals is caused by the temperature of the metal or impurities in the metal. Both increases in temperature and higher levels of impurities impede the flow of electricity through the metal materia... More »

Resistance as a quantity is symbolized by the letter "R" in algebraic equations. It is measured in units called ohms, which are abbreviated as "Ω," the capitalized Greek letter omega. In electronics, resistance is the op... More »

Some electrical formulas include Ohm's Law, which states that voltage equals current times resistance, and the formulas associated with Kirchhoff's Laws, one of which states that the sum of all voltages must add up to 0.... More » Science Physics Electricity

Electrical currents always follow the path of least resistance. They require three conditions in order to flow: a difference in voltage between two points, a conductive path and a closed circuit. When these conditions ar... More » Science Physics Electricity

When a short circuit occurs, electrical current experiences little to no resistance because its path has been diverted from its normal direction of flow. This in turn produces excess heat and can damage or destroy an ele... More »

Some of the basics of electrical engineering are current, voltage and resistance. These are three of the essential building blocks of electricity, and it is important to understand electricity at a fundamental level befo... More »